FM放送とマルチパスを適応フィルタで極めてみた / Solving multipath distortion of FM broadcast by adaptive filters

FM放送とマルチパスを適応フィルタで極めてみた / Solving multipath distortion of FM broadcast by adaptive filters

さくらの夕べ 研究所ナイト 2020年1月16日 発表原稿

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Kenji Rikitake

January 16, 2020
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    Kenji Rikitake Γ͖͚ͨ ͚Μ͡ ྗ෢ ݈࣍ 16-JAN-2020 ͘͞Βͷ༦΂ ݚڀॴφΠτ Sakura

    Internet Fukuoka Office Fukuoka City, Fukuoka, Japan @jj1bdx Kenji Rikitake / Sakura Lab Night 16-JAN-2020 2
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    దԠϑΟϧλͷ࣮૷ྫ 1980೥୅ʹ࿦จൃද 1 ྛً඙ࢯʹΑΔFMDDC-3 ྗ෢ʹΑΔairspy-fmradion 1 ๬݄ ޹ࢤ, Ӌௗ ޫढ़,

    దԠσΟδλϧϑΟϧλʹΑΔFMϚϧνύεͻͣΈࣗಈআڈͷҰํࣜ, ςϨϏδϣϯֶձࢽ, 1985, 39 ר, 3 ߸, p. 228-234, ެ։೔ 2011/03/14, Online ISSN 1884-9652, Print ISSN 0386-6831, h>ps:/ /doi.org/ 10.3169/itej1978.39.228, h>ps:/ /www.jstage.jst.go.jp/arHcle/itej1978/39/3/39_3_228/_arHcle/-char/ja Kenji Rikitake / Sakura Lab Night 16-JAN-2020 11
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    దԠϑΟϧλΛVOLKͰ࠷దԽ • ίϯύΠϥʹ೚ͤΔͱݶք͕͋Δ • VOLK: SIMD໋ྩద༻ϥΠϒϥϦ h-p:/ /libvolk.org/ • ϧʔϓͰॲཧͰ͖Δ΋ͷΛSIMDʹ͢Δ

    • ੵ࿨ԋࢉ͸6ഒͷߴ଎Խ2 2 Kaby Lake, volk_32fc_x2_dot_prod_32fc(), generic -> u_avx_fma Kenji Rikitake / Sakura Lab Night 16-JAN-2020 12
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    #if !VOLK for (unsigned int i = 0; i <

    m_filter_order; i++) { output += m_state[i] * m_coeff[i]; } #else // VOLK volk_32fc_x2_dot_prod_32fc(&output, m_state.data(), m_coeff.data(), m_filter_order); #endif // VOLK Kenji Rikitake / Sakura Lab Night 16-JAN-2020 13
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    Thank you Graphics credits: • Audacity simula.on: Kenji Rikitake •

    Mul.path impulse response: I, Cantalamessa, h>ps:/ / commons.wikimedia.org/wiki/ File:Mul.path_impulse_response.png from Wikimedia Commons, licensed CC BY 2.5 Kenji Rikitake / Sakura Lab Night 16-JAN-2020 15